Cisco 8832 Factory Reset Does Not Work

[summam]

I have multiple 8832s that pulled a bad firmware version which essentially stops the phone from registering. When I go try to factory reset these devices, nothing happens. Factory reset is never initialized as described in the manual.

I hold the # key, the LED bar turns white then shuts off, I release #, press 123456789*0#, there's no visual indication that that sequence does anything, and the phone boots like it usually does.

What's going on here? Why doesn't this standard sequence work with this model?

[balaji.bandi]

Look at the thread user have same issue and it was resolved.

https://community.cisco.com/t5/ip-telephony-and-phones/cisco-ip-phone-8832-factory-reset/td-p/3388749

[summam]

I looked at that thread extensively. There's no explanation as to why the factory reset procedure didn't work for some users. The only resolution was booting from the inactive firmware.

[Leo Laohoo]

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@summam wrote:

There's no explanation as to why the factory reset procedure didn't work for some users. 

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Could be a bug.  

The best way is to force the phone to boot the back-up firmware.